Submission #338202

#	Time	Username	Problem	Language	Result	Execution time	Memory
338202		zggf	Combo (IOI18_combo)	C++14	10 / 100	76 ms	440 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(int N) {

	char firstLetter;
	if(press("X")) firstLetter = 'X';
	else if(press("Y")) firstLetter = 'Y';
	else if(press("A")) firstLetter = 'A';
	else if(press("B")) firstLetter = 'B';

	string wyn = "";
	wyn.push_back(firstLetter);
	for(int i = 1; i < N; i++){
		if(firstLetter!='A'&&press(wyn+"A")-wyn.size()>0) {wyn.push_back('A'); continue;}
		if(firstLetter!='B'&&press(wyn+"B")-wyn.size()>0) {wyn.push_back('B'); continue;}
		if(firstLetter!='X'&&press(wyn+"X")-wyn.size()>0) {wyn.push_back('X'); continue;}
		if(firstLetter!='Y'&&press(wyn+"Y")-wyn.size()>0) {wyn.push_back('Y'); continue;}
	}
	return wyn;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:22: warning: 'firstLetter' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |   if(firstLetter!='B'&&press(wyn+"B")-wyn.size()>0) {wyn.push_back('B'); continue;}
      |      ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 95